<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>filter筛选数组</title>
</head>
<body>
  <script>
    // filter 筛选数组   返回的是一个新的数组

    // 元素的值
    // 元素的索引
    // 被遍历的数组本身
    var arr = [12, 66, 4, 88, 3, 7]
    var newArr = arr.filter(function (value, index) {
      // return value >= 20
      return value % 2 === 0
    })
    console.log(newArr)
  </script>
</body>
</html>